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1、手机维修资料（Mobilemaintenanceinformation）Mobilemaintenanceinformation(Rookiemustsee)Mobilephones,novices,data,maintenanceMobilemaintenanceinformation(Rookiemustsee)Mobilephones,novices,data,maintenanceFirst,thebootsmallcurrent5-15MAorso(mainlybecauseCPUdoesnotwork)?clockcircuitsarenotnormal(13Mand32.76
2、8K)-voltage,AFC,frequencyTheclockcrystalitselfisdamaged;--replacementofcrystals(mobilephonemaintenance)Theclockcrystalproducesasignal,butdoesnotsendittotheCPU;--checkthelinebetweenthecrystalandtheCPUClockpowersupplyisnotnormal(checkpowerorcrystalpowersupplytube)Resetvoltageisnotnormal,mainlyresetc
3、ircuitworkisnotnormal(checkthepowercircuitoraseparateresettube)CPUthepowersupplyisnotnormal,usuallythepowerICdoesnotoutputtheVCCvoltage,orthepowersupplytubeitselfisnotpoweredTheCPUitselfisdamaged(directreplacement)Two,bootcurrentofabout30-60MA(mainlythelogiccircuitworkisnotnormal)Thecharacterlinec
4、ircuitisnotworkingproperlyPowersupplyisabnormalResetisabnormal(poweronresetandpoweronreset)ThechipisnotnormalDatalineandaddresslineareabnormalThefontitselfiscorrupted(referstotheinternaltemporarystorageofthefontortheinternalbrokenlegofthefont)CPUdamage(referstoCPUbrokenlegorcontrollerdamage,MOblin
5、kseriesCPUbadwillhave80-150MAdeadcurrent)Theprograminthefontisoutoforder.Three,bootlargecurrent(pressthebootbuttoncurrentismuchlargerthanthenormalbootcurrent,200-600MArange)Isthemainpowersupplyloadcausedbytheleakageofthebootcurrentoverhaulthiskindoffault,tobefamiliarwithorunderstandthemotherboardc
6、ircuitdevicefunctionandpowersupply,thesedevicesareusuallyintheirnextbigcapacitor,thecapacitanceofthepowersupplyendispositive,reverseresistancecapacitanceanodecircuit,youcanknowthepowersupplywirewhetherleakage.Four,pluspoweronthelargecurrent(referstothepoweronthemotherboard,thepositiveandnegativele
7、akage)Itismainlycausedbythedamageofcomponentsdirectlysuppliedbybatteries,suchaspoweramplifiercircuit,powersupplycircuit,powersupplytube,chargingcircuit,groundelement,etc.connectedwithpowerline.Thesecondsectioncan
